Finding the Fourth Proportional to 12,911.52, 17,816.42 and 7,245.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,911.52 : 17,816.42 = 7,245.50 : x
2. Step 2: Convert to fraction form
   12,911.52/17,816.42 = 7,245.50/x
3. Step 3: Cross multiply
   12,911.52x = 17,816.42 × 7,245.50
4. Step 4: Simplify right side
   12,911.52x = 129,088,745.80
5. Step 5: Solve for x
   x = 129,088,745.80/12,911.52
6. Step 6: Final answer
   x = 9,997.95